METHOD OF PRODUCING MULTI-LAYER COATING FOR CUTTING TOOL Russian patent published in 2018 - IPC C23C14/06 C23C14/24 B23B27/14 

FIELD: metallurgy.

SUBSTANCE: application of multi-layer coating is performed. First, a lower layer of titanium nitride is applied. Then, an intermediate layer of the titanium and aluminium nitride compound is applied at a ratio, wt %: titanium 83.5-89.5, aluminium 10.5-16.5. Then, the upper layer of the titanium, aluminium and zirconium nitride compound is applied at a ratio, wt %: titanium 73.0-81.0, aluminium 7.0-11.0, zirconium 12.0-16.0. Coating is applied by three cathodes arranged horizontally in one plane. The first cathode is made of titanium and aluminium alloy, the second cathode is made of titanium and opposed to the first cathode, while the third cathode is made of titanium and silicon alloy and arranged between the first and the second cathodes. The lower layer is applied using the third cathode, the intermediate layer - using the first and the third cathodes, and the top layer - using all three cathodes.

EFFECT: increasing the efficiency of the cutting tool.

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